intel_th: Add "rtit" source device

In some versions of Intel TH, the Software Trace Hub (STH) has a second
MMIO BAR dedicated to the input from Intel PT. This calls for a new
subdevice that will be enumerated if the corresponding BAR is present.
Signed-off-by: NAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/intel_th/core.c

@@ -500,6 +500,24 @@ static const struct intel_th_subdevice {
 		.name	= "sth",
 		.type	= INTEL_TH_SOURCE,
 	},
+	{
+		.nres	= 2,
+		.res	= {
+			{
+				.start	= REG_STH_OFFSET,
+				.end	= REG_STH_OFFSET + REG_STH_LENGTH - 1,
+				.flags	= IORESOURCE_MEM,
+			},
+			{
+				.start	= TH_MMIO_RTIT,
+				.end	= 0,
+				.flags	= IORESOURCE_MEM,
+			},
+		},
+		.id	= -1,
+		.name	= "rtit",
+		.type	= INTEL_TH_SOURCE,
+	},
 	{
 		.nres	= 1,
 		.res	= {

drivers/hwtracing/intel_th/intel_th.h

@@ -228,6 +228,7 @@ int intel_th_output_enable(struct intel_th *th, unsigned int otype);
 enum th_mmio_idx {
 	TH_MMIO_CONFIG = 0,
 	TH_MMIO_SW = 1,
+	TH_MMIO_RTIT = 2,
 	TH_MMIO_END,
 };
 

drivers/hwtracing/intel_th/pci.c

@@ -20,6 +20,7 @@
 enum {
 	TH_PCI_CONFIG_BAR	= 0,
 	TH_PCI_STH_SW_BAR	= 2,
+	TH_PCI_RTIT_BAR		= 4,
 };
 
 #define BAR_MASK (BIT(TH_PCI_CONFIG_BAR) | BIT(TH_PCI_STH_SW_BAR))
@@ -75,8 +76,8 @@ static int intel_th_pci_probe(struct pci_dev *pdev,
 		[TH_MMIO_CONFIG]	= pdev->resource[TH_PCI_CONFIG_BAR],
 		[TH_MMIO_SW]		= pdev->resource[TH_PCI_STH_SW_BAR],
 	};
+	int err, r = TH_MMIO_SW + 1;
 	struct intel_th *th;
-	int err;
 
 	err = pcim_enable_device(pdev);
 	if (err)
@@ -86,8 +87,12 @@ static int intel_th_pci_probe(struct pci_dev *pdev,
 	if (err)
 		return err;
 
-	th = intel_th_alloc(&pdev->dev, drvdata, resource, TH_MMIO_END,
-			    pdev->irq);
+	if (pdev->resource[TH_PCI_RTIT_BAR].start) {
+		resource[TH_MMIO_RTIT] = pdev->resource[TH_PCI_RTIT_BAR];
+		r++;
+	}
+
+	th = intel_th_alloc(&pdev->dev, drvdata, resource, r, pdev->irq);
 	if (IS_ERR(th))
 		return PTR_ERR(th);